using System.Collections.Generic;
using System.Threading.Tasks;
using Opc.Ua;
using Shouldly;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Host.Domain;
using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;

namespace ZB.MOM.WW.LmxOpcUa.Tests.Integration
{
    public class HistorizingFlagTests
    {
        private static FakeGalaxyRepository CreateRepo()
        {
            return new FakeGalaxyRepository
            {
                Hierarchy = new List<GalaxyObjectInfo>
                {
                    new GalaxyObjectInfo { GobjectId = 1, TagName = "TestObj", BrowseName = "TestObj", ParentGobjectId = 0, IsArea = false }
                },
                Attributes = new List<GalaxyAttributeInfo>
                {
                    new GalaxyAttributeInfo { GobjectId = 1, TagName = "TestObj", AttributeName = "HistorizedAttr", FullTagReference = "TestObj.HistorizedAttr", MxDataType = 2, IsHistorized = true },
                    new GalaxyAttributeInfo { GobjectId = 1, TagName = "TestObj", AttributeName = "NormalAttr", FullTagReference = "TestObj.NormalAttr", MxDataType = 5, IsHistorized = false },
                    new GalaxyAttributeInfo { GobjectId = 1, TagName = "TestObj", AttributeName = "AlarmAttr", FullTagReference = "TestObj.AlarmAttr", MxDataType = 1, IsAlarm = true },
                }
            };
        }

        /// <summary>
        /// Verifies that historized Galaxy attributes advertise OPC UA historizing support and history-read access.
        /// </summary>
        [Fact]
        public async Task HistorizedAttribute_HasHistorizingTrue_AndHistoryReadAccess()
        {
            var fixture = OpcUaServerFixture.WithFakeMxAccessClient(repo: CreateRepo());
            await fixture.InitializeAsync();
            try
            {
                using var client = new OpcUaTestClient();
                await client.ConnectAsync(fixture.EndpointUrl);

                var nodeId = client.MakeNodeId("TestObj.HistorizedAttr");
                var historizing = client.ReadAttribute(nodeId, Attributes.Historizing);
                ((bool)historizing.Value).ShouldBeTrue();

                var accessLevel = client.ReadAttribute(nodeId, Attributes.AccessLevel);
                var level = (byte)accessLevel.Value;
                (level & AccessLevels.HistoryRead).ShouldBe(AccessLevels.HistoryRead,
                    "HistoryRead bit should be set");
            }
            finally { await fixture.DisposeAsync(); }
        }

        /// <summary>
        /// Verifies that non-historized Galaxy attributes do not claim OPC UA history support.
        /// </summary>
        [Fact]
        public async Task NormalAttribute_HasHistorizingFalse_AndNoHistoryReadAccess()
        {
            var fixture = OpcUaServerFixture.WithFakeMxAccessClient(repo: CreateRepo());
            await fixture.InitializeAsync();
            try
            {
                using var client = new OpcUaTestClient();
                await client.ConnectAsync(fixture.EndpointUrl);

                var nodeId = client.MakeNodeId("TestObj.NormalAttr");
                var historizing = client.ReadAttribute(nodeId, Attributes.Historizing);
                ((bool)historizing.Value).ShouldBeFalse();

                var accessLevel = client.ReadAttribute(nodeId, Attributes.AccessLevel);
                var level = (byte)accessLevel.Value;
                (level & AccessLevels.HistoryRead).ShouldBe((byte)0,
                    "HistoryRead bit should not be set");
            }
            finally { await fixture.DisposeAsync(); }
        }
    }
}